Lincoln Electric SVM105-B service manual Output and Control Circuits, FET Modules Current

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TOC

TOC

E-5

THEORY OF OPERATION

E-5

 

 

 

 

 

 

FIGURE E-5 --OUTPUT & CONTROL CIRCUITS

 

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LINE

 

SWITCH

1

 

2

 

3

3A

 

FAN

AUXILIARY

TRANSFORMER

 

TO

WIREFEEDER

 

 

POWER SWITCH

 

 

 

 

 

 

SECTIONS

 

MAIN

 

RECTIFIER

 

 

20KHZ

 

CHOKE

 

 

 

TRANSFORMER

 

 

 

HEATSINK

 

 

LEFT SWITCH BOARD

 

 

 

 

 

 

 

 

 

 

 

FET MODULES

 

TOP

 

 

 

 

 

 

 

 

 

 

CAP

 

 

 

 

 

 

 

 

 

 

1 DIODE

 

 

FET MODULES

CURRENT

 

 

 

1˘ OR 3˘ DETETCTION (H5)

 

 

 

 

 

TRANSFORMER

 

 

 

 

 

 

 

 

 

 

PRE-CHARGE

 

 

 

 

 

INPUT

DRIVER

 

 

 

 

 

RECTIFIER

BOARD

 

CONTROL

 

 

5 DIODES

 

CR1

 

 

 

 

 

 

BOARD

 

 

 

AC1

 

PROTECTION

 

 

 

PULSE

 

 

 

 

AC2

BOARD

Y-Y FEEDBACK

BOTTOM

 

 

TRAIN

 

 

AC3

 

 

 

 

 

CR2

 

 

 

 

 

 

 

 

 

 

 

A-LEAD

 

 

 

 

 

 

24VDC

PRE-CHARGE

 

 

 

 

 

 

 

 

 

 

 

 

 

RIGHT SWITCH BOARD

 

 

 

 

18VAC

2ND STEP PWM

FET MODULES

 

 

 

5 DIODES

 

 

 

 

 

 

 

 

 

 

 

 

POWERBOARD

CAP

 

 

 

 

24VAC

 

 

 

 

 

 

 

 

TOP

 

 

 

 

FET MODULES

 

 

 

 

 

 

 

 

 

 

 

<1 VDC

 

 

 

1 DIODE

 

 

 

 

 

 

 

 

 

 

CHOKE

LOCAL

METER

MODE POT

POT

VOLTAGE FEEDBACK

REMOTE

 

 

 

 

 

1ST STEP PWM VOLTAGE

 

CURRENT FEEDBACK-PROTECTION

15VDC-CONTROL BOARD FUNCTION VOLTAGE 24VAC-THERMOSTATS-GUN TRIGGERING

CHOKE

SHUNT

TOC

TOC

OUTPUT AND CONTROL CIRCUITS

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The AC output of the transformer is changed to DC by the Output Rectifier. The Output Choke between the negative side of the rectifier and the negative output stud provides the necessary filtering for DC welding. The two smaller chokes and their series diodes are the OCV boost circuit used to help provide good weld starts.

Current feedback to the Control Board is provided by the shunt in the negative output circuit. It is used for weld control, overcurrent protection and actual amme- ter readings. The Voltage feedback lead at the positive output stud also provides information for weld control and actual voltmeter readings.

The Control Board monitors input from the front panel controls (output, arc control, mode switch, etc..). The software on the board processes these inputs, sets up the proper weld information and sends the “set” para- meter information to the meter.

When weld output is requested, the Control Board compares the input information to the feedback signals and provides the correct PWM signals to the Switch Boards for optimum welding. The Mode Switch setting determines which feedback signal (voltage or current) will have the most relevance. However, both signals are used in all modes.

The Control Board also monitors signals from the ther- mostats and the Protection Board and if necessary, shuts off the weld output. The protection circuit infor- mation is discussed in more detail later in this section.

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NOTE: Unshaded areas of block logic diagram are the subject of discussion

V300-PRO

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Contents Invertec V300-PRO Safety Electric Shock can kill ARC Rays can burnFumes and Gases can be dangerous Iii SafetyWelding Sparks can cause fire or explosion Cylinder may explode if damagedSûreté Pour Soudage a L’Arc Précautions DE SûretéMaster Table of Contents for ALL Sections Table of Contents Installation SectionSection A-1 Three Phase Single Phase InstallationProduct Description Electrical Installation Input Voltage SetupLocation Three Phase Input Power Input ConnectionConnection of Wire Feeders to the Invertec Single Phase InputRemote Control of Invertec K900-1 DC TIG Starter ConnectionParallel Operation Quick Disconnect Plugs K852-7 Output CablesSection B-1 Operation SectionControl Function / Operation OperationOperating Instructions Duty CycleFull Range Is Is Very Soft, 10 Is Very Crisp Mode SwitchAuxiliary Power Meter Polarity SwitchSection C-1 Accessories SectionOptions / Accessories AccessoriesSection D-1 Maintenance SectionInput Filter Capacitor Discharge Procedure MaintenanceOverload Protection Preventive MaintenanceFigure D.2 Location of Maintenance Components Section E-1 Theory of Operation SectionInput Line Voltage & Auxiliary Transformer Theory of OperationReturn to Section To Section TOC Precharge & Protection CircuitsCurrent Switch BoardsFET Modules Current Output and Control CircuitsPassive Pulse Width Modulation Minimum OutputMaximum Output Protective Circuits Overload ProtectionThermal Protection Section F-1 Troubleshooting & Repair SectionHOW to USE Troubleshooting Guide Troubleshooting & RepairPC Board Troubleshooting Procedures Additional Information Oscilloscope Warning Input Filter Capacitor CONDITION- INGMatched Parts Department Feeding ProblemsFeeding Problems See Input Rectifier test See Output Diodes test See Switch Board test V300-PRO Test Description Input Filter Capacitor Discharge ProcedureFigure F.I Location of Input Filter Capacitor Terminals Input Filter Capacitor Discharge ProcedureOutput Pilot Circuit Test Output Pilot Circuit TESTcont J2 J4 J3 G2527V300-PRO Protection Board Output Test Troubleshooting & Repair Test Procedure Figure F.6 Inserting Probes ProtectionCapacitor Balance Test Static Capacitor Test 912 V300-PRO Switch Board Test Switch Board Test Switch Board Test Table F.3 Snubber Resistor Test Check Test Result Conclusion Next Test Step Repair Action Snubber Resistor Test402/ R W 403 404Output Diode Test Output Diode Test Test ProcedureInput Rectifier Test Table F.5 Points StepsProbe Acceptable Meter Reading Overcurrent Protection Current Trigger Test Overcurrent Protection Current Trigger Test 302275D Control Overvoltage Protection DC Trigger Circuit Test Figure F.16 PC Boards Removed Overvoltage Protection DC Trigger Circuit Test311 309 310 #301 #305 1J8 #311 1J14 6J6 #302#313 #275D 3J8 2J14 1J6Thermal Protection AC Trigger Circuit Thermal Protection AC Trigger Circuit Figure F.20 PC Boards Moved for AccessFigure F.21 Thermal Protection AC Trigger Circuit V300-PRO Power Board Test Power Board Test Test aTest B Figure F.23 Power Board Test Points Simplified Trigger Circuit Capacitor Removal and Replacement Procedure Procedure Capacitor Removal and ReplacementFigure F.27 -- Removing Capacitor Nuts Figure F.27 Switch Board Removal and Replacement Procedure Procedure Switch Board ReplacementTest After Switch Board or Capacitor Replacement Perform Retest After Repair Test After Switch Board or Capacitor ReplacementOutput Diode Replacement Procedure Procedure Paralleled IndividualDiodes Output Diode Replacement ProcedureProcedure Diode Modules 61TROUBLESHOOTING & REPAIRF-61Min. Acceptable Max. All Modes V300-I V300-PRO Retest After RepairOCV at rated Input V300-PRO OutputSection G-1 Electrical Diagrams SectionV300 PRO Wiring Diagram Entire Machine Code 9825 & 9965 L8657+ ARC Wiring Diagram Entire Machine Code 9934 L8841ARC Wiring Diagram Entire Machine Code 10034 L9299I T C H 13,15 B O a R D F T Wiring Diagram Entire Machine Code 10035 L9301Wiring Diagram Entire Machine Code 10130 L9567 Wiring Diagram Entire Machine Code 10131 L9569 Wiring Diagram Entire Machine Code 10256 L10189 Wiring Diagram Entire Machine Code 10257 L10191 Controlboard #.$ #$ !#$ #!%&$ Schematic Entire MachineSchematic Driver PC Board S20216 Identification PC Board Assembly Driver L8660Schematic Driver PC Board S20799 Description PC Board Assembly DriverSchematic Switch PC Board L8440 CAPACITOR, Cemo 2700P 50V 5% PC Board Assembly Switch L8441Schematic Switch PC Board L10956 Reqd Identification PC Board Assembly Switch L10958-1Schematic Control PC Board G2525 Electrical Diagrams CAPACITOR, Cemo 150P Schematic Protection PC Board M16097 OCI1, OCI2, OCI3, OCI4 PC Board Assembly Protection L7915-2Schematic Power PC Board M16018 VOLT. REG. & Heat Sink Asbly PC Board Assembly Power L8033-7

SVM105-B specifications

The Lincoln Electric SVM105-B is a state-of-the-art welding machine that represents a leap forward in welding technology, designed for both professionals and enthusiasts in the welding industry. This versatile machine combines robust performance with user-friendly features, making it suitable for a wide range of welding applications.

One of the key features of the SVM105-B is its advanced inverter technology. This allows for a lightweight design without compromising on power output. The inverter technology ensures a stable arc and precise control, enabling consistent weld quality across various materials, including mild steel, stainless steel, and aluminum. This feature is particularly beneficial for users who demand exceptional performance in both thin and thick materials.

The SVM105-B also boasts an impressive output range, typically between 10A to 105A, allowing for adaptability to different welding tasks. Its ability to seamlessly switch between DC and AC modes makes it an ideal choice for professionals working in diverse environments, facilitating operations such as TIG and stick welding. This versatility is further enhanced by its compatibility with various electrode types, ensuring a more efficient and effective welding process.

User safety and comfort have not been overlooked in the design of the SVM105-B. Equipped with an efficient cooling system, this machine effectively manages heat during prolonged use, ensuring durability and longevity. Additionally, its intuitive digital display provides real-time feedback on settings, making it easier for users to monitor parameters and make necessary adjustments on the fly.

The SVM105-B is built with portability in mind. Its compact and lightweight design makes it easy to transport, enabling welders to bring their equipment to job sites without hassle. Furthermore, the machine features sturdy handles that contribute to its ease of maneuverability, supporting the demands of both inside workshops and outdoor projects.

Moreover, Lincoln Electric places a strong emphasis on quality and reliability, and the SVM105-B is a testament to this commitment. The machine is constructed from durable materials designed to withstand the rigors of daily use, ensuring it remains a staple in any welder's toolkit for years to come.

In conclusion, the Lincoln Electric SVM105-B stands out with its combination of advanced inverter technology, versatile output, user-friendly interface, and robust construction. Whether for professional or hobbyist use, this welding machine meets a wide array of welding needs while providing excellent performance and durability.